Arc furnace

Abstract

Provided is an arc furnace, including: a furnace body having a bottomed cylindrical shape; a furnace lid that openably closes an opening of the furnace body; an electrode that is provided at the furnace lid and melts a metal material supplied into the furnace body by electric discharge; a tilting floor that is tiltable within a plane substantially perpendicular to the tilting floor; and a rotation mechanism that is provided on the tilting floor inward from an outer circumference of the furnace body to support a bottom wall of the furnace body, and rotates the furnace body around a cylinder axis thereof.

What is claimed is: 
     
       1. An arc furnace, comprising:
 a furnace body having a bottomed cylindrical shape; 
 a furnace lid that openably closes an opening of the furnace body; 
 an electrode that is provided at the furnace lid and melts a metal material supplied into the furnace body by electric discharge; 
 a tilting floor that is tiltable within a plane substantially perpendicular to the tilting floor; and 
 a rotator that is provided on the tilting floor inward from an outer circumference of the furnace body to support a bottom wall of the furnace body, and rotates the furnace body around a cylinder axis thereof, 
 the rotator comprises:
 a ring body provided at an outer circumferential portion of a bottom wall of the furnace body, 
 a connecting portion formed on an inner circumferential surface of the ring body; 
 a bearing member that is provided at a necessary part of a bottom surface of the ring body to support the ring body rotatably around a center thereof; and 
 a driver that is provided on the tilting floor inward of the ring body and has an output portion connected to the connecting portion, 
 
 the ring body comprises a circular-ring-shaped support frame, and a gear body fixed to a bottom surface of an inner circumferential portion of the support frame, 
 the connecting portions comprise tooth profiles formed on the entire circumference of the inner circumferential portion of the support frame, 
 the gear body comprises:
 the tooth profiles, 
 an outer circumferential intermediate portion protruding outward as a rectangular section and providing an inner ring portion of the bearing member, and 
 an outer ring portion with a U-shaped section wrapping the inner ring portion, 
 
 a roller bearing interposed between a concave surface of the outer ring portion, top and bottom surfaces, and an outer peripheral edge surface of the inner ring portion, and 
 the outer ring portion having a bottom surface fixed to the tilting floor. 
 
     
     
       2. The arc furnace according to  claim 1 , further comprising:
 a stopper including stopper members provided at a ring body side and a tilting floor side, fitted to each other to restrict rotation of the ring body when the ring body is in a predetermined rotation position. 
 
     
     
       3. An arc furnace, comprising:
 a furnace body having a bottomed cylindrical shape; 
 a furnace lid that openably closes an opening of the furnace body; 
 an electrode that is provided at the furnace lid and melts a metal material supplied into the furnace body by electric discharge; 
 a tilting floor that is tiltable within a plane substantially perpendicular to the tilting floor; 
 a rotator provided on the tilting floor inward from an outer circumference of the furnace body to support a bottom wall of the furnace body, and rotate the furnace body around a cylinder axis thereof; 
 the rotator comprising a ring body provided at an outer circumferential portion of a bottom wall of the furnace body, and a circular-ring-shaped support frame, and 
 a stopper including stopper members provided at a ring body side and a tilting floor side, fitted to each other to restrict rotation of the ring body when the ring body is in a predetermined rotation position, 
 the stopper members comprising: 
 a cylindrical sheath provided at the ring body side and including a tapered inner circumference, 
 a tapered plug provided on the tilting floor side, and 
 a drive cylinder including a rod connected to a rear end of the tapered plug, the drive cylinder to advance the tapered plug into the cylindrical sheath to restrict rotation of the furnace body.